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@ 2015-10-29T13:57:27Z

<?php
//old code
function v1($first, $last)
{
    $result = trim($first);
    $lastName = trim($last);
    if ($lastName) {
        if (!empty($result)) {
            $result .= ',';
        }
        $result .= $lastName;
    }

    return $result;
}

//my
function v2($first, $last)
{
    return implode(",", [trim($first), trim($last)]);
}

//@Hunternnm 
function v3($first, $last)
{
    if(strlen($first) > 0 && strlen($last) > 0) {
        return $first.",".$last;
    }
    
    if(strlen($first) > 0) {
        return $first;
    } else {
        return $last;
    }
}

//@NelinD  
function v4($first, $last)
{
    return implode(',', array_filter([$first, $last], function ($string) {
        return trim($string);
    }));
}


function v($first, $last)
{
    echo v1($first, $last);
    echo PHP_EOL;
    echo v2($first, $last);
    echo PHP_EOL;
    echo v3($first, $last);
    echo PHP_EOL;
    echo v4($first, $last);
    echo PHP_EOL;
    echo PHP_EOL;
}

v('first', 'last');
v('first', '');
v('first', ' ');
v('', last);
v(' ', last);
v(' ', last);

Output for git.master, git.master_jit, rfc.property-hooks: first,last first,last first,last first,last first first, first first first first, first, first Fatal error: Uncaught Error: Undefined constant "last" in /in/IXKBB:62 Stack trace: #0 {main} thrown in /in/IXKBB on line 62
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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